We have a small leak from a copper pipe going to a radiator.
The system will need to be drained for some other plumbing job. Can I just reheat the joint and get the remaining solder to form a nice seal again?
There is no solder as pipe going into radiator is a compression joint. If you mean it's leaking from a nearby capillary joint then you can try, but I'd dismantle and re-make.
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